UNIT 19.4 SAGE Analysis from 1 µg of Total RNA

  1. Jerry Cai,
  2. David Ash,
  3. Ethylin Wang Jabs

Published Online: 1 NOV 2002

DOI: 10.1002/0471143030.cb1904s16

Current Protocols in Cell Biology

Current Protocols in Cell Biology

How to Cite

Cai, J., Ash, D. and Jabs, E. W. 2002. SAGE Analysis from 1 µg of Total RNA. Current Protocols in Cell Biology. 16:19.4:19.4.1–19.4.10.

Author Information

  1. Johns Hopkins University, Baltimore, Maryland

Publication History

  1. Published Online: 1 NOV 2002
  2. Published Print: OCT 2002


Serial analysis of gene expression (SAGE) is a powerful transcription-profiling method that allows simultaneous expression analysis of thousands of transcripts, provides absolute digital readout of the expression level, and identifies new genes. A disadvantage of SAGE is the relatively high amount of input RNA required. Consequently, several techniques have been developed to overcome this limitation, so that SAGE can be applied to very limited amounts of starting material, e.g., small biological samples such as tissue biopsies or microdissected materials. Here we describe a modified version of the original microSAGE protocol, which requires only 1 to 2 ug total RNA. This method avoids PCR amplification of cDNA and reamplification of ditags, procedures that potentially compromise the quantitative nature of this technique.